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Title:
VACUUM CARBURIZING METHOD, AND CARBURIZING FURNACE THEREFOR
Document Type and Number:
Japanese Patent JP2001240954
Kind Code:
A
Abstract:

To provide a carburizing furnace to implement a carburizing method in which the number of ethylene molecules in a carburizing chamber is substantially nonincreased from the beginning to the terminating period of carburization when ethylene and hydrogen are used as the vacuum carburizing gas.

The vacuum carburizing furnace comprises a carburizing chamber 2 to carburize a work inside, a vacuum carburizing gas feed means 4 to feed the vacuum carburizing gas containing ethylene gas and hydrogen gas to the work in the carburizing chamber 2 from the top, and an evacuating means 6 to suck the gas in the carburizing chamber 2 from the bottom of the work. It further comprises an increase/decrease detecting means 33 to detect the increase/decrease of the number of molecules of ethylene gas, and an exhaust quantity adjusting means 7 to adjust the exhaust quantity of the vacuum carburizing gas to be exhausted from the carburizing chamber 2 based on the increase/decrease of the number of molecules of ethylene gas.


Inventors:
YAMAGUCHI KAZUYOSHI
KURATA HARUHIRO
MATSUBARA SHU
Application Number:
JP2000000056594
Publication Date:
September 04, 2001
Filing Date:
March 02, 2000
Export Citation:
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Assignee:
KOYO THERMO SYS KK
International Classes:
C23C8/20; C21D1/06; C21D1/773; F27D7/06; (IPC1-7): C23C8/20; C21D1/06; C21D1/773; F27D7/06
Attorney, Agent or Firm:
岸本 瑛之助 (外4名)